Dormant vs Undefined - What's the difference?

As adjectives the difference between dormant and undefined

is that dormant is inactive, sleeping, asleep, suspended while undefined is lacking a definition or value.

* dormaunt (obsolete)

(-)

Inactive, sleeping, asleep, suspended.

Grass goes dormant during the winter, waiting for spring before it grows again.

The bank account was dormant ; there had been no transactions in months.

This volcano is dormant but not extinct.

* Burke

It is by lying dormant a long time, or being very rarely exercised, that arbitrary power steals upon a people.

(heraldry) In a sleeping posture; distinguished from couchant.

a lion dormant

* active * active, extinct

* * *

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(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined